Vol. 54.] EXPOSED IN THE CUTTING OF THE NEW BRUGES CANAL. 579 



* Cythere villosa, Sars. 



,, lutea, Mliller. 

 ,, albomaculata, Baird. 

 ,, Robertsoni, Brady. 

 Cytheridea vunctillata, Brady. 

 Eucythere declivis (Norman). 

 Loxoconclia impressa (Baird). 

 „ fragilis, Brady. 



,, tamarindus (Jones). 



* Cytherura angiilata, Brady. 



* ;, striata, Sars. 



* „ gihha (Mtiller). 



* „ cellulosa (Norman). 

 Cytherideis subulata, Brady. 

 Cytkero^pteron, sp. ? 



Prof. Brad J observes : ' The ostracoda are purely marine, and 

 are almost identical in every vt^ay with such as we get on tho 

 ISTorthumberland coast — in estuarine mud, or in muddy situations 

 between tide-marks. Some of my lists from such localities might 

 be substituted for yours with little or no variation.' 



Scrobicularia [plana]-Glaj 

 (resting upon peat). 



A mechanical analysis of this clay yielded the following results : — 



Weight before washing 3 oz. = 1*000 



Weight after washing : — 



Eetained in the sVinch mesh •0069 



„ ^V „ , -0069 



Passed the x^o-i^^ch mesh, and deposited by subsidence "7916 



•8262 

 Clay =18 per cent. 



Dr. Hinde says : — ' The sponge-spicules from this material form a 

 very insignificant proportion of its contents. I found only about a 

 dozen fragments altogether in the coarser sample (j-J-^-inch mesh) ; 

 these are for the most part trifid spicules of tetractineliid sponges 

 resembling those of the recent genns Geodia. These spicules are 

 now opal or milky white in appearance, like detached spicules found 

 in the German Senonian or in our Upper Greensand, where similar 

 forms are very common, and I should say that these Bruges spicules 

 have been washed out of some Cretaceous beds. I find also one 

 dermal spicule and one skeletal spicule of a lithistid sponge, having 

 a similarly ancient appearance to those mentioned above. 



' In the finer material (subsidence-matter) were some globate 

 dermal spicules of (r^oc^ia-sponges, in the same condition as the 

 trifids, and there were some fragments of acerate and pin-shaped 

 spicules, probably of monactinellid sponges, which still retained the 

 fresh glassy appearance of recent and Tertiary spicules, and these 

 would probably be of the same age as the diatoms and fresh-looking 

 foraminifera in the deposit. 



' Some of the diatoms are pyritized like those found in the London 

 Clay of Kent. I also noticed detached prisms of Tnoceramus-^\iQ\\.s 



